Adding to 11011111110020 its reverse (2001111111011), we get a palindrome (13012222221031).
Subtracting from 11011111110020 its reverse (2001111111011), we obtain a palindrome (9009999999009).
It is a happy number.
It is an unprimeable number.
Almost surely, 211011111110020 is an apocalyptic number.
11011111110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
11011111110020 is a wasteful number, since it uses less digits than its factorization.
11011111110020 is an evil number, because the sum of its binary digits is even.
The spelling of 11011111110020 in words is "eleven trillion, eleven billion, one hundred eleven million, one hundred ten thousand, twenty".